package com.xinziruo.richclient.util;

import java.util.HashMap;

/**
 * HTML解码
 * @author internet
 * @modify by ajian
 *
 */
public class HTMLDecoder {
	 public static final HashMap<String, Character>	charTable;  
	  
	 public static String decode(String s) {  
	 	String t;  
	 	Character ch;  
	 	int tmpPos, i;  
		int maxPos = s.length();  
	    StringBuffer sb = new StringBuffer(maxPos);  
	    int curPos = 0;  
	    while (curPos < maxPos) {  
	    	char c = s.charAt(curPos++);  
	    	if (c == '&') {  
	    		tmpPos = curPos;  
	    		if (tmpPos < maxPos) {  
	    			char d = s.charAt(tmpPos++);  
	    			if (d == '#') {  
	    				if (tmpPos < maxPos) {  
	    					d = s.charAt(tmpPos++);  
	    					if ((d == 'x') || (d == 'X')) {  
	    						if (tmpPos < maxPos) {  
	    							d = s.charAt(tmpPos++);  
	    							if (isHexDigit(d)) {  
	    								while (tmpPos < maxPos) {  
	    									d = s.charAt(tmpPos++);  
	    									if (!isHexDigit(d)) {  
	    										if (d == ';') {  
	    											t = s.substring(curPos + 2, tmpPos - 1);  
	    											try {  
	    												i = Integer.parseInt(t, 16);  
	    												if ((i >= 0) && (i < 65536)) {  
	    													c = (char) i;  
	    													curPos = tmpPos;  
	    												}  
	    											} catch (NumberFormatException e) {  
	    											}  
	    										}  
	    										break;  
	    									}  
	    								}  
	    							}  
	    						}  
	    					} else if (isDigit(d)) {  
	    						while (tmpPos < maxPos) {  
	    							d = s.charAt(tmpPos++);  
	    							if (!isDigit(d)) {  
	    								if (d == ';') {  
	    									t = s.substring(curPos + 1, tmpPos - 1);  
	    									try {  
	    										i = Integer.parseInt(t);  
	    										if ((i >= 0) && (i < 65536)) {  
	    											c = (char) i;  
	    											curPos = tmpPos;  
	    										}  
	    									} catch (NumberFormatException e) {  
	    								}  
	    							}  
	    							break;  
	    						}  
	    					}  
	    				}  
	    			}  
	    		} else if (isLetter(d)) {  
	    			while (tmpPos < maxPos) {  
	    				d = s.charAt(tmpPos++);  
	    				if (!isLetterOrDigit(d)) {  
	    					if (d == ';') {  
	    						t = s.substring(curPos, tmpPos - 1);  
	    						ch = (Character)charTable.get(t);  
	    						if (ch != null) {  
	    							c = ch.charValue();  
	    							curPos = tmpPos;  
	    						}  
	    					}  
	    					break;  
	    				}  
	    			}  
	    		}  
	    	}  
	    }  
	    	sb.append(c);  
	    }  
	    return sb.toString();  
	}  
	  
	private static boolean isLetterOrDigit(char c) {  
		return isLetter(c) || isDigit(c);  
	}  
	  
	private static boolean isHexDigit(char c) {  
		return isHexLetter(c) || isDigit(c);  
	}  
	  
	private static boolean isLetter(char c) {  
	    return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z'));  
	}  
	  
	private static boolean isHexLetter(char c) {  
	    return ((c >= 'a') && (c <= 'f')) || ((c >= 'A') && (c <= 'F'));  
	}  
	  
	private static boolean isDigit(char c) {  
	    return (c >= '0') && (c <= '9');  
	}  
	  
	public static String compact(String s) {  
	    int maxPos = s.length();  
	    StringBuffer sb = new StringBuffer(maxPos);  
	    int curPos = 0;  
	    while (curPos < maxPos) {  
	    	char c = s.charAt(curPos++);  
	    	if (isWhitespace(c)) {  
	        	while ((curPos < maxPos) && isWhitespace(s.charAt(curPos))) {  
	        		curPos++;  
	        	}  
	        	c = '\u0020';  
	    	}  
	    	sb.append(c);  
	    }  
	    return sb.toString();  
	}  
	  
	// HTML is very particular about what constitutes white space.  
	public static boolean isWhitespace(char ch) {  
		return (ch == '\u0020') || (ch == '\r') || (ch == '\n') || (ch == '\u0009') || (ch == '\u000c') || (ch == '\u200b');  
	}  
	  
	static {  
		charTable = new HashMap<String, Character>();  
		charTable.put("quot", new Character((char) 34));  
		charTable.put("amp", new Character((char) 38));  
		charTable.put("apos", new Character((char) 39));  
		charTable.put("lt", new Character((char) 60));  
		charTable.put("gt", new Character((char) 62));  
		charTable.put("nbsp", new Character((char) 160));  
		charTable.put("iexcl", new Character((char) 161));  
		charTable.put("cent", new Character((char) 162));  
		charTable.put("pound", new Character((char) 163));  
		charTable.put("curren", new Character((char) 164));  
		charTable.put("yen", new Character((char) 165));  
		charTable.put("brvbar", new Character((char) 166));  
		charTable.put("sect", new Character((char) 167));  
		charTable.put("uml", new Character((char) 168));  
		charTable.put("copy", new Character((char) 169));  
		charTable.put("ordf", new Character((char) 170));  
		charTable.put("laquo", new Character((char) 171));  
		charTable.put("not", new Character((char) 172));  
		charTable.put("shy", new Character((char) 173));  
		charTable.put("reg", new Character((char) 174));  
		charTable.put("macr", new Character((char) 175));  
		charTable.put("deg", new Character((char) 176));  
		charTable.put("plusmn", new Character((char) 177));  
		charTable.put("sup2", new Character((char) 178));  
		charTable.put("sup3", new Character((char) 179));  
		charTable.put("acute", new Character((char) 180));  
		charTable.put("micro", new Character((char) 181));  
		charTable.put("para", new Character((char) 182));  
		charTable.put("middot", new Character((char) 183));  
		charTable.put("cedil", new Character((char) 184));  
		charTable.put("sup1", new Character((char) 185));  
		charTable.put("ordm", new Character((char) 186));  
		charTable.put("raquo", new Character((char) 187));  
		charTable.put("frac14", new Character((char) 188));  
		charTable.put("frac12", new Character((char) 189));  
		charTable.put("frac34", new Character((char) 190));  
		charTable.put("iquest", new Character((char) 191));  
		charTable.put("Agrave", new Character((char) 192));  
		charTable.put("Aacute", new Character((char) 193));  
		charTable.put("Acirc", new Character((char) 194));  
		charTable.put("Atilde", new Character((char) 195));  
		charTable.put("Auml", new Character((char) 196));  
		charTable.put("Aring", new Character((char) 197));  
		charTable.put("AElig", new Character((char) 198));  
		charTable.put("Ccedil", new Character((char) 199));  
		charTable.put("Egrave", new Character((char) 200));  
		charTable.put("Eacute", new Character((char) 201));  
		charTable.put("Ecirc", new Character((char) 202));  
		charTable.put("Euml", new Character((char) 203));  
		charTable.put("Igrave", new Character((char) 204));  
		charTable.put("Iacute", new Character((char) 205));  
		charTable.put("Icirc", new Character((char) 206));  
		charTable.put("Iuml", new Character((char) 207));  
		charTable.put("ETH", new Character((char) 208));  
		charTable.put("Ntilde", new Character((char) 209));  
		charTable.put("Ograve", new Character((char) 210));  
		charTable.put("Oacute", new Character((char) 211));  
		charTable.put("Ocirc", new Character((char) 212));  
		charTable.put("Otilde", new Character((char) 213));  
		charTable.put("Ouml", new Character((char) 214));  
		charTable.put("times", new Character((char) 215));  
		charTable.put("Oslash", new Character((char) 216));  
		charTable.put("Ugrave", new Character((char) 217));  
		charTable.put("Uacute", new Character((char) 218));  
		charTable.put("Ucirc", new Character((char) 219));  
		charTable.put("Uuml", new Character((char) 220));  
		charTable.put("Yacute", new Character((char) 221));  
		charTable.put("THORN", new Character((char) 222));  
		charTable.put("szlig", new Character((char) 223));  
		charTable.put("agrave", new Character((char) 224));  
		charTable.put("aacute", new Character((char) 225));  
		charTable.put("acirc", new Character((char) 226));  
		charTable.put("atilde", new Character((char) 227));  
		charTable.put("auml", new Character((char) 228));  
		charTable.put("aring", new Character((char) 229));  
		charTable.put("aelig", new Character((char) 230));  
		charTable.put("ccedil", new Character((char) 231));  
		charTable.put("egrave", new Character((char) 232));  
		charTable.put("eacute", new Character((char) 233));  
		charTable.put("ecirc", new Character((char) 234));  
		charTable.put("euml", new Character((char) 235));  
		charTable.put("igrave", new Character((char) 236));  
		charTable.put("iacute", new Character((char) 237));  
		charTable.put("icirc", new Character((char) 238));  
		charTable.put("iuml", new Character((char) 239));  
		charTable.put("eth", new Character((char) 240));  
		charTable.put("ntilde", new Character((char) 241));  
		charTable.put("ograve", new Character((char) 242));  
		charTable.put("oacute", new Character((char) 243));  
		charTable.put("ocirc", new Character((char) 244));  
		charTable.put("otilde", new Character((char) 245));  
		charTable.put("ouml", new Character((char) 246));  
		charTable.put("divide", new Character((char) 247));  
		charTable.put("oslash", new Character((char) 248));  
		charTable.put("ugrave", new Character((char) 249));  
		charTable.put("uacute", new Character((char) 250));  
		charTable.put("ucirc", new Character((char) 251));  
		charTable.put("uuml", new Character((char) 252));  
		charTable.put("yacute", new Character((char) 253));  
		charTable.put("thorn", new Character((char) 254));  
		charTable.put("yuml", new Character((char) 255));  
		charTable.put("OElig", new Character((char) 338));  
		charTable.put("oelig", new Character((char) 339));  
		charTable.put("Scaron", new Character((char) 352));  
		charTable.put("scaron", new Character((char) 353));  
		charTable.put("fnof", new Character((char) 402));  
		charTable.put("circ", new Character((char) 710));  
		charTable.put("tilde", new Character((char) 732));  
		charTable.put("Alpha", new Character((char) 913));  
		charTable.put("Beta", new Character((char) 914));  
		charTable.put("Gamma", new Character((char) 915));  
		charTable.put("Delta", new Character((char) 916));  
		charTable.put("Epsilon", new Character((char) 917));  
		charTable.put("Zeta", new Character((char) 918));  
		charTable.put("Eta", new Character((char) 919));  
		charTable.put("Theta", new Character((char) 920));  
		charTable.put("Iota", new Character((char) 921));  
		charTable.put("Kappa", new Character((char) 922));  
		charTable.put("Lambda", new Character((char) 923));  
		charTable.put("Mu", new Character((char) 924));  
		charTable.put("Nu", new Character((char) 925));  
		charTable.put("Xi", new Character((char) 926));  
		charTable.put("Omicron", new Character((char) 927));  
		charTable.put("Pi", new Character((char) 928));  
		charTable.put("Rho", new Character((char) 929));  
		charTable.put("Sigma", new Character((char) 931));  
		charTable.put("Tau", new Character((char) 932));  
		charTable.put("Upsilon", new Character((char) 933));  
		charTable.put("Phi", new Character((char) 934));  
		charTable.put("Chi", new Character((char) 935));  
		charTable.put("Psi", new Character((char) 936));  
		charTable.put("Omega", new Character((char) 937));  
		charTable.put("alpha", new Character((char) 945));  
		charTable.put("beta", new Character((char) 946));  
		charTable.put("gamma", new Character((char) 947));  
		charTable.put("delta", new Character((char) 948));  
		charTable.put("epsilon", new Character((char) 949));  
		charTable.put("zeta", new Character((char) 950));  
		charTable.put("eta", new Character((char) 951));  
		charTable.put("theta", new Character((char) 952));  
		charTable.put("iota", new Character((char) 953));  
		charTable.put("kappa", new Character((char) 954));  
		charTable.put("lambda", new Character((char) 955));  
		charTable.put("mu", new Character((char) 956));  
		charTable.put("nu", new Character((char) 957));  
		charTable.put("xi", new Character((char) 958));  
		charTable.put("omicron", new Character((char) 959));  
		charTable.put("pi", new Character((char) 960));  
		charTable.put("rho", new Character((char) 961));  
		charTable.put("sigmaf", new Character((char) 962));  
		charTable.put("sigma", new Character((char) 963));  
		charTable.put("tau", new Character((char) 964));  
		charTable.put("upsilon", new Character((char) 965));  
		charTable.put("phi", new Character((char) 966));  
		charTable.put("chi", new Character((char) 967));  
		charTable.put("psi", new Character((char) 968));  
		charTable.put("omega", new Character((char) 969));  
		charTable.put("thetasym", new Character((char) 977));  
		charTable.put("upsih", new Character((char) 978));  
		charTable.put("piv", new Character((char) 982));  
		charTable.put("ensp", new Character((char) 8194));  
		charTable.put("emsp", new Character((char) 8195));  
		charTable.put("thinsp", new Character((char) 8201));  
		charTable.put("zwnj", new Character((char) 8204));  
		charTable.put("zwj", new Character((char) 8205));  
		charTable.put("lrm", new Character((char) 8206));  
		charTable.put("rlm", new Character((char) 8207));  
		charTable.put("ndash", new Character((char) 8211));  
		charTable.put("mdash", new Character((char) 8212));  
		charTable.put("lsquo", new Character((char) 8216));  
		charTable.put("rsquo", new Character((char) 8217));  
		charTable.put("sbquo", new Character((char) 8218));  
		charTable.put("ldquo", new Character((char) 8220));  
		charTable.put("rdquo", new Character((char) 8221));  
		charTable.put("bdquo", new Character((char) 8222));  
		charTable.put("dagger", new Character((char) 8224));  
		charTable.put("Dagger", new Character((char) 8225));  
		charTable.put("bull", new Character((char) 8226));  
		charTable.put("hellip", new Character((char) 8230));  
		charTable.put("permil", new Character((char) 8240));  
		charTable.put("prime", new Character((char) 8242));  
		charTable.put("Prime", new Character((char) 8243));  
		charTable.put("lsaquo", new Character((char) 8249));  
		charTable.put("rsaquo", new Character((char) 8250));  
		charTable.put("oline", new Character((char) 8254));  
		charTable.put("frasl", new Character((char) 8260));  
		charTable.put("euro", new Character((char) 8364));  
		charTable.put("image", new Character((char) 8465));  
		charTable.put("weierp", new Character((char) 8472));  
		charTable.put("real", new Character((char) 8476));  
		charTable.put("trade", new Character((char) 8482));  
		charTable.put("alefsym", new Character((char) 8501));  
		charTable.put("larr", new Character((char) 8592));  
		charTable.put("uarr", new Character((char) 8593));  
		charTable.put("rarr", new Character((char) 8594));  
		charTable.put("darr", new Character((char) 8595));  
		charTable.put("harr", new Character((char) 8596));  
		charTable.put("crarr", new Character((char) 8629));  
		charTable.put("lArr", new Character((char) 8656));  
		charTable.put("uArr", new Character((char) 8657));  
		charTable.put("rArr", new Character((char) 8658));  
		charTable.put("dArr", new Character((char) 8659));  
		charTable.put("hArr", new Character((char) 8660));  
		charTable.put("forall", new Character((char) 8704));  
		charTable.put("part", new Character((char) 8706));  
		charTable.put("exist", new Character((char) 8707));  
		charTable.put("empty", new Character((char) 8709));  
		charTable.put("nabla", new Character((char) 8711));  
		charTable.put("isin", new Character((char) 8712));  
		charTable.put("notin", new Character((char) 8713));  
		charTable.put("ni", new Character((char) 8715));  
		charTable.put("prod", new Character((char) 8719));  
		charTable.put("sum", new Character((char) 8721));  
		charTable.put("minus", new Character((char) 8722));  
		charTable.put("lowast", new Character((char) 8727));  
		charTable.put("radic", new Character((char) 8730));  
		charTable.put("prop", new Character((char) 8733));  
		charTable.put("infin", new Character((char) 8734));  
		charTable.put("ang", new Character((char) 8736));  
		charTable.put("and", new Character((char) 8743));  
		charTable.put("or", new Character((char) 8744));  
		charTable.put("cap", new Character((char) 8745));  
		charTable.put("cup", new Character((char) 8746));  
		charTable.put("int", new Character((char) 8747));  
		charTable.put("there4", new Character((char) 8756));  
		charTable.put("sim", new Character((char) 8764));  
		charTable.put("cong", new Character((char) 8773));  
		charTable.put("asymp", new Character((char) 8776));  
		charTable.put("ne", new Character((char) 8800));  
		charTable.put("equiv", new Character((char) 8801));  
		charTable.put("le", new Character((char) 8804));  
		charTable.put("ge", new Character((char) 8805));  
		charTable.put("sub", new Character((char) 8834));  
		charTable.put("sup", new Character((char) 8835));  
		charTable.put("nsub", new Character((char) 8836));  
		charTable.put("sube", new Character((char) 8838));  
		charTable.put("supe", new Character((char) 8839));  
		charTable.put("oplus", new Character((char) 8853));  
		charTable.put("otimes", new Character((char) 8855));  
		charTable.put("perp", new Character((char) 8869));  
		charTable.put("sdot", new Character((char) 8901));  
		charTable.put("lceil", new Character((char) 8968));  
		charTable.put("rceil", new Character((char) 8969));  
		charTable.put("lfloor", new Character((char) 8970));  
		charTable.put("rfloor", new Character((char) 8971));  
		charTable.put("lang", new Character((char) 9001));  
		charTable.put("rang", new Character((char) 9002));  
		charTable.put("loz", new Character((char) 9674));  
		charTable.put("spades", new Character((char) 9824));  
		charTable.put("clubs", new Character((char) 9827));  
		charTable.put("hearts", new Character((char) 9829));  
		charTable.put("diams", new Character((char) 9830));  
	}
}